Improvement in head-blocks for saw-mills



ANDBW sHnARON, Aony RICHMOND,

' fs-AAR, JOHN eAAaJoNAs GAAR, AND wrLLmMe. scorr.

INDIANA, ASSIGNOB TO ABRAHAM .IMPROVEMENT |N`HEAD-BLOCKS FOR SAW-MILLS.

, Specification forming part of Letters VPatent No. 103,245, dated May17, 1870.

To whom t may concernr j Beitknown that I, ANDREW SHEARON, of Richmond,Wayne county, Indiana, have inventedcertain new and useful Improvementsin Head-Blocks forSaw-Mills; andI do hereby declare that the followingis a full, clear, and exact description of the same, reference beinghad' to the drawings which accompany this specification, forming apartof the same, and to the letters of reference marked thereon.

Like letters refer to like parts.

Plate 1: Figure l is a perspective view of the head-blocks and carriage.Fig. 2 is an obverse view of one of the compound wheels attached to andpropelling the screw. Fig. 3 is auinterior view of the same. Fig. 4 is aview of the inner side ofthe plate forming the inside of the same. Fig.5 is a view ofthe interior;l of the compound wheel, having the circularratchet reversed from that shown in Fig. 3.

Pla`te2: Fig. 1 is an obverse vertical sectional view of the operatin gparts of the headblock, taken at a point perpendicular to the insideface of front-side framing.

The object of my invention consists in providing a direct, positive, andcontinuous motion to the screw-shaft which carries the knee of thehead-block, by the backward and forward throw or vibrations of ahand-lever, placed in a central position between the saddles of thecarriage-frame.

It further consists in regulating the length of vibration of thehand-lever by means of an adjustable pin and temper-screw, so as toallow of the most delicate variations of thickness of lumber to besecured with accuracy and precision.

To enable those skilled in the art to make and operate my invention, Iwill now proceed to describe the same.

In Plate l, Fig. l, A A A represent a recti-V linear framin g of wood,constructed in the ordinary manner, having the saddles B B placedacrossll the same, at convenient distances from cach other, properlysecured. Upon the saddles B B are iitted knees C C, arranged to traversethe same. Each knee is provided with lug, c, which is constructed in anut, which ireceives and is operated by the screw- Shaft D. The saddlesB B are provided, at

one end of each, with an eye, e, which serves as `a-journal-boxforv oneend of the screwshaft D. vH is a hand-lever, pivoted to a bar whichforms the base ot' asemicircular frame,

which-.is attached to the side rail of the fra1ning at a pointintermediate between the saddles AB B. Immediately abovea the-point atwhichthe lever H is pivoted to the frame I it receives a pitman-bar,Gr,'by a jointed connection, the opposite end of which is attached' 4theextent of which is regulated and defined by a stop-pin, N, placed inholes j j, and the temper-screw J.

At either end of the connecting-rod F are secured horizontal toothedracks E E, and operated by said rod through the functions ot' the leverH and -pitman-bar Gr, and receiving a reciprocating motion. Thesetoothed racks have their bearings upon grooved frictionrollers w m whosejournals are secured to the lower outer corners of the angle-plates M M.The toothed racks E E gear into and operate the pinions m m m m of thecompound wheels K K L L, `producing a partial revolution in alternatedirections of the pinlons and the inner plates, k, of the compoundWheels, to

which they are rigidly attached. The ends otl the screw-shafts d form ajournal for the compound wheels K K, and the journals of the compoundwheels L L are secured to the upper outer corners of the angle-plates MM, respectively. The outer or front portion of the compound wheels K Kand L L are provided with cogs or spur-gearing on their peripheries, thewheels K and L, which mesh into each other when in motion, beingrecessed, and provided with right and left handed ratchets upon theshoulders of said recesses upon the inner faces of said compound wheels.The plates k 7c have, on the sides opposite the pinions m m, a notchedpawl-lever, t, actuated by an oval cam, d', which has a handle, l, onthe opposite side of the plate k. The end of this paWllever t, which isnotched, as shown at a', en-

gages the ratchet a of the recess of the conlpound wheel, causing it torevolve as it is operated by means of the pinion m and the toothed rackE in one direction only. The spring s holds the pawl-lever in itsrequisite position, allowing it to pass or slip the teeth of the ratchetfn in its opposite motion. This pawl-lever t is thrown in or out of gearby the handle Z, as shown in the dotted lines in Fig. 2.

A forward motion being communicated to the screw-shaft D by the throw ofthe handlever H, acting on the connecting-rod F, the toothed rack E, thepinion m, the plate 7c, and the pawl-lever t of the compound wheel K, areverse throw of the lever H, acting by means of the same devices,operates the compound wheel L in an opposite direction, and, by means ofthe spur-gearing on the periphery of the wheel L, the wheel K isrevolved in its original direction, and a direct positive forward motionof the screw-shaft is thus produced by each forward and backward motionof the connecting-rod.

When the knee- C is thus carried by the action of the screw shaft D andthe nut c the requisite distance on its way across the carriage, thepawl-levers tt t t are released by means of the handles Z l l l, and areverse motion is given to the screw-,shaft D by the operator, by meansof the crank-pin b bringing t-he knee to its required position again,when the pawl-levers are replaced and the head-block again ready foruse.

The lugs a a of the semicircular frame I are slotted at right angleswith the plane of the frame, to allow of its lateral adjustment.

The angle-plates M M are firmly attached to the ends of the saddle-treesB B, and act as a frame to sustain and support the operating devices ofthe machine. I

Having thus fully described my said invention, what I desire to secureby Letters Patent 1s- 1. The hand-lever H, pitman G, connectingrod F,toothed bars E E, pinions m m, plates 7c k, pawls t t, springs s s, camsb b', compound wheels K K and L L, and screw-shaft D, all all arrangedand operatin g in the manner and for the purposes set forth.

2. The semicircular frame I, with its holes j j, stop-pin N, andtemper-screw J, as and for the purposes specied.

3. The arrangement and combination of the devices herein set forth forproducing a continuous forward motion of the knees of a sawmillhead-block, substantially in the manner and for the purposes set forth.

ANDREW SHEARON.

Witnesses.

Mosns GRooMs, W. T. DENNIS.

